Compensating joint



1 June 12,1931.

E. BAGBY COMPENSATING JOINT Filed Feb. 27, 1950 Inventor EarZejyZy',

A iiomgy Patented June 2, 1931 J p PATENT OFFICE EARIQE BAGBY, OF KAHOKA, MISSOURI COMPENSATING JOINT Application filed February 27, 1930. Serial No. 431,815.

This invention appertains to new and useful improvements in compensating joints, and the same has particular reference to compensating joints for needle bar pistons of the type employed on the Singer sewing 'machine, model 29-4. devised for shoe patching.

The principal object of this invention is to provide a joint which continuously takes up slack caused by wear of the moving parts thereof that would otherwise result in seriously impairing the operation of machines of the type specified above.

Other important objects and advantages 5 of the invention willbecome apparent to the reader as the specification proceeds hereinafter.

In the drawing Figure 1 represents a side elevational view showing the novel joint connecting the needle bar with the needle bar driving lever.

Fig. 2 represents a longitudinal sectional view through the joint.

Fig. 3 is a bottom plan view of the joint.

Fig. 1 is a plan view of theleaf spring employed in the joint.

Referring to the drawings wherein like numerals designate like parts, the numeral 5 represents the usual needle bar driving so lever, such as are now employed .on the 7 model 29-4; Singer shoe patching machine,

the opening 6 being for the fulcrum pin.

The novel joint for driving the needle bar 7 includes a head 8 having a bar 9 projecting therefrom, a portion of which is cut away or recessed to receive the block 12. A depending pintle 10 is provided to the bar 9 for slidably engaging the block 12 in the hole 11.

The free end of the bar 9 is bifurcated as at 13 and the adjacent end of the block 12 is also bifurcated as at 14. A curved leaf spring 15 is interposed between the bar 9 and the block 12 and has an opening 16 therein through which the pintle 10 extends.

The end of the spring 15 corresponding to the free end of the bar 9 is bifurcated for receiving one end of the driving lever 5 in cooperation with the block 12 and the bar 9. The driving lever at this particular end The head 8 is provided with a pair of apertured ears 1818" and through th m ears is disposed the pin 19 for pivotally con- I n'ecting the needle bar 7 to the head 8.

In operation the spring 15 constantly exerts pressure tending to force the block 12 out of the recess in which it is lodged away from the bar 9. As the sewing machine is driven the inner surface of the barrel 17 and the outer surfaces of the block 12 and bar 9 wear away, simultaneously; however, the pressure exerted by the spring 15 keeps the bar 9 and the block 12in unlform contact with the inner surfaces of the barrel 17 and thus prevents annoying and destructive knocking that would normally take place in the joint.

While the foregoing specification specifically sets forth the invention, it is to be understood that numerous changes in the shape, size, and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having thus described my invention, what I claim as new is:

1. In a sewing machine of the character described, a needle bar, a driving lever for U the needle bar, a wear compensating connection between one end of the driving lever and said needle bar, said compensating connection comprising a rigid barrel on the driving lever, a pair of bars disposed within said barrel and being normally spaced apart,

resilient means interposed between said bars for maintaining the same spread apart, a

head on one of said bars and a pivotal consection between said head and said needle 2. In a sewing machine of the character described, a needle bar, a driving lever for the needle bar, a wear compensating connection between one end of the driving lever and the said needle bar, said, compensating connections comprisin a rigid barrel on the driving lever, a pair 0% bars disposed within the said barrel and being normally spaced apart, a leaf spring interposed between the 7 bars for maintaining the salnespread apart, a head on one of the said bars, and a pivotal connection between the said head and the said needle bar.

In testimony whereof Iaffix my signa ture.

ABDEz A BY-I 

